Henry hochklassen



No. 749,822; I

PATENTED JAN. 19, 1904;

H. .HOGHKLASSBN. TYPE WRITING MACHINE. Arrmonion FILED my as, 1902.

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PATENTED JAN.'19, 1904.

1 H. HOCHKLASSEN. TYPE WRITINGMAGHINE;

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useful Improvements in Type-VVriting Ma- UNITED STATES Patented January 19, 1904.

PATENT OFFICE.

COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION.

TYPE-WRITING MACHINE.

SPECIFICATION forming part of Letters Patent No. 749,822, dated January 19, 1904.

Application filed May 26, 1902. Serial N0..109,021. (N0 model.) i

To all whom it may concern:

Be it known that I, HENRYHOCHKLASSEN, a citizen of the United States, and a resident of the city of Chicago, in the county of Cook and State of Illinois, have invented certain new and chines, of which the following is a full, clear, and exact description.

This invention has for its object to provide improved means for adjusting the tension of the springs whereby the key-levers of a typewriting machine are returned to normal position after they have been depressed to operate the type-bars.

The invention consists in the features of improvement hereinafter described, illustrated in the accompanying drawings, and particularly pointed out in the claims at the end of this specification.

Figure 1 is a view in central vertical section from front to rear through the main frame and portions of a type-writing machine embodying my invention. Fig. 2 is an enlarged detail view in vertical section, parts being shown in elevation, through the spring-bridge and adjacent parts at the rear of the machine. Fig. 3 is a detail plan view of the spring-bridge, certain of the springs being shown in position. Fig. a is an enlargedview in cross-section on line A 4 of Fig. 3. Fig. 5 is a view similar to Fig. 4, but with the spring omitted. Fig. 6 is an enlarged plan view of a portion of the spring-bridge and the upper end of one of the coiled springs.

A designates the main frame of the machine, within the base of which are pivotally mounted, as at a, the key-levers B, that extend from front to rear of the machine, these key-levers having their forward ends furnished. with finger-keys 7), whereby the key-levers are operated. The key-levers are preferably made of metal plates, and, as shown, each of these levers is formed adjacent its rear end with a slot 2 to receive a hook 0 at the lower end of a corresponding coiled retracting-spring C, whereby the key-lever is held in the normal position shown in the drawings. As shown, a coiled retracting-spring C is provided for each of the key-levers B, and these springs are supported by a spring bridge or bar D, that is preferably formed of cast metal. The bar D extends from side to side of the main frame of the machine and is furnished at its ends with depending portions 3, having ofi'set lugs 4, adapted to extend beneath offsets 5, formed upon the interior of the main frame of the machine. The offset lugs 4 have holes 6 therein to receive adjusting-screws 7, the threaded upper end of which screws enter correspondingly-threaded holes 8 in the offset lug 5 of the main frame. The heads of the screws 7 serve to support the spring-bridge D, and by the adjustment of these screws the bridge can be bodily adjusted.

In order to effect the individual adjustment of the retracting-springs C, the spring-bridge D is formed with anumber of holes (Z, that are threaded to receive the upper convolutions of the springs C. Preferably each of the springs C has its upper end 0 bent inwardly, as shown in Figs. 3 and 6, to receive a forked wrench, whereby the spring can be turned in order to effect its adjustment within the threaded hole d of the spring-bridge. Provision has been heretofore made for adjusting the individual retracting springs whereby the key-levers are held in normal position; but so far asI am aware this invention presents the first instance of a construction in which the convolutions of the individual springs are utilized for the adjustment of the springs.

From the foregoing construction it will be seen that when the spring-bridgehas been set. in place and a general adjustment of the springs has been effected the spring-bridge can be adjusted bodily by'means of the screws 7. When, however, the tension of any one of the individual springs C is to be varied, this can be readily eflected by turning the spring itself, the convolutions of the spring engaging with the threads of the springbridge. As shown, the back of themachine is provided with a cover-plate F, that extends above the spring-bridge D, this cover-plate F being attached by one or more screws f to the back of the main frame. The cover-plate F, if employed, will be removed when the ad-' purpose.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a type-writing machine the combination with pivoted key-levers, of coil-springs for retracting said levers to normal position, means whereby said springs may be individually adjusted, a bridge-bar to which the upper ends of said springs are connected and means for adjusting said bridge-bar.

2. In a type-writing machine, the combination with a lever, of a coiled retracting-spring for returning said lever to its normal position and a support having threads engaging the coils of said retracting-spring.

3. In a type-writing machine, the combination with a key-lever, of a coiled retractingspring for returning said lever to normal position, a support for the upper end of said spring provided with a hole having threads with which the'coils of the spring engage, whereby said spring may be adjusted.

4:. In a type-Writing machine, the combination with a key-lever, of a coiled retractingspring for said lever, a support for the upper end of said spring having a hole provided with threads with which the upper coils of the spring engage, said spring being provided with an extension or projecting part whereby the spring maybe turned to effect its adjustment.

HENRY HOCHKLASSEN. Witnesses:

HARRY L. CLAPP, ALBERTA ADAMICK. 

